Piston-packing



NITED STATES PATENT OFFICE.

JOHN BOOTH, OF DETROIT, MIOHIGAN.

PlSTON-PACKlNG.

SPEGI FICATION forming part of Letters Patent No. 246,712, datedSeptember 6, 1881. Application filcd July 12, 1881. (No model.) Patentedin England January 31, 1879.

1`0 all 'whom t't may conce'm:

` Be it known that I, JOHN BOOTH, ofDetroit, countyr of VVayne, Stateot' Michigan, have invented a new and useful Im provementinCorrurugated-SpringPiston-Packiug; and I hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable-others skilled in the art to which it pertains to make and usethe same, reference being had to the accompanying dra-wings, which forma part of this specilication.

My invention relates to the combinations of devices and appliances setforth in the specification and more fully pointed out in the claim. Inthedrawings, Figure lis a View ofasteamcylinder with the centralIportion broken away,

and showing the piston-head in section. Fig.

' 2is aplan view of the piston-head elnbodying my invention, With thetop plate removed,

showingthe springs coiled up in position. Fig.

3 represents views of the springs employed in the interior of thepiston-head.

The object of my invention is to provide a suitable packin g forpiston-heads, plungers of pnmps, &c., where metallic packing isnecessary, and also which-shallhave a tendency outward toward the innersurface of the cylinder, so that no matter how much the outer rings ofthe piston-liead or the inner surface of the cylinder shall wear awaythere will always be a` tight inetallic joint formed. i

To this end, A is a cylinder. B is the pistonhead,of whichbisthe upperplate,and b'is the lower one. bare therings. On the top ofthe lowerplate, b', are coiled springs c o', making, as it were, a double spring.These sprin gs are encircled by the rings b3, which are made in theusual form of piston-rings, and are arranged so that the splits in themopen at different sides of the piston-head. The spring o, I propose tomake corrugated, and o' is a plain spiral-spring. The corrugated springc presses against the rings, and the plain one, c', is coiled up at thesame time as the corrugated one and 4 5 intersects between each lap ofthe corrugated one, so that the spring c cannot catch in itself, forwere the plain spring o' not in its position the corrugated spring wouldget entangled in its own corrugations and nullify the object of theinvention.

D is the piston-rod, which runs up in the nsual way through both of theplates b b'. On the top of the plate b' is cast or otherwise fastened acollar, bz, which acts as a steadier for the piston-rod and to receivethe screws which hold the top plate, b, in position.

I am aware that corrugated-spring packing has been used; but it has beenfound that in the use of it when the springs overlapped the end of eachother the tension was lessened, owing to the tendency of the springbinding` itself in the corrugations of the first round of the spring,and when one single round was used the tension was not sufficient toexpand the rings.

It will be seen that by the arrangement of springs in the interior of apiston-head it not only makes a tight-fitting piston-head, but one whichwill give to any imperfection of the inside of the cylinder.

In fitting the springs into theinterior of the piston-head, I propose toturn up a small piece of Vthe plain spiral spring', so that the end ofthe corrugated spring will fit into it and be held secure. This willprevent them slipping, 7 5 and will make them both act together.

WVhat I claim is- A spring-packing for piston-heads, consisting of oneor more split rings backed by a spring composed of a strip ot' fluted orcorru- 80 gated metal and an adjacent strip of plain metal coiledtogether', substantiallyr as described.

ln testimony whereofI sign this specification in the presence of twowitnesses.

JOHN BOOTH.

Witnesses:

HENRY F. QUELGH, H. M. PERRINE.

